Carbureter.



D. WL DE WITT.

CARBURETER.

APPLICATION FILED OCT. 6, i926.

Patented May 7,1918.

WITNESSES 4 TTOR/VEYS DAVID MARTIN DE WITT, OF RUSSELLVILLE, ARKANSAS.

CARBURE Application filed October 6 T 0 all whom it may concern Be it known that 1, Dane M. Di: vvrrr. 'acitizen of the United States, and a resident of Russellville, in the county oi l-ope and State of Arkansas. have invented a new and Improved Carburetor. of which the following is a full, clear. and exact description.

' My invention has for its object. to provide a carburetor having a vacuum chaue' her which is also the fuel chamber connected with a nozzle in a mixing chamber. there being a valve connection between the ,vacuum chamber and the outlet from the mixing chamber, the valve of which is connected with a float in the vacuum chamber so that when the level of hydrocarbon in the Vacuum chamber goes below norinat. the valve will be opened by the downward movement of the float, and the suction at the out let will reestablish the. vacuum in the vacuum chamber to maintain the level of the hydrocarbon.

Additional obie cts of the invention will appear in the ellowing specification, in which the preferred form of the invention is disclosed.

In the drawings similar reference characters denote similar parts in all tho views, in which- Figure l is a sectional elevation illustrating the construction of my carburetor; and

Fig. 2 is a sectional view on the line of Fig. 2.

, By referring to the drawings, it will be seen that the carburetor is provided with a casing 5 inclosing a vacuum chamber 6 and a suction pipe 7 provided with a trans verse wall 8 forming the bottom of a mixing chamber, the suction pipe 7 having a conical wall 10 forming a nozzle at the top of the mixing chamber. Disposed in the mixing chamber 9 there is a nozzle 11 which is fed through an opening 12 in the transverse wall 8, there being another nozzle 13 disposed within the nozzle 11 which is fed from the vacuum chamber through an opening 14 in a pipe 15 which connects the member 5 with the suction pipe 7 and the nozzles 11 and 13. In the bottom of the nozzle 13 adjacent the opening 14 11. the pipe 15, there is a needle valve seat 16, controlled by a needle valve 17, the said needle valve 17 having" a thread 18 which meshes in a threaded opening 19 in an elbow 2U Specification of Letters Patent.

Patented May 7' 193%.

Serial No. 124070.

It will be understood that the h vdroearbon flowing out of the nozzle 12-) \vill'miX with the air flowing out oi llwa nozzle ll, and that this mixture will pass out ol' the nozzle at the top of the mixing chamber formed by the conical wall it). The suction pipe T at the mixing chamher t) has a branch 21. the end of which is threaded at 22, a cap 23 being provided with an inner thread it meshing with the threa l This cap 23 has a valve seat '15. against which a valve 26 pressesoutwardly. This pressure is maintained by a spring 27 which engages the valve 2n. the spring-'27 being coiled around a spindle is having ahead 29 with which the ends oi the spring 2'? i threadei cd opening 3 in a il'llli.\\'\i. t member 32 secured to the cap'2 l. With thisv construction it will be understood that by turning the spindle 28 by its operating member 3-3, the head 29 on the spindle may be moved inwardly or outwardly. to regulate the tension of the spring 97. The tension of the .rino' 27 may be adjusted, as has been stated, the function of the valve 96 being to automatically increase the supply of air in the mixing chamber when the engine is running :t high speed. There is a valve 34 in the suction pipe 7 to regulate the air which flows to the nozzlc 1'1. and there a valve in the suction pipe 7 beyond the nozzle formed by the conical wall 10.

In the bottozn of the casing there is an i i l pipe 37 which extends upwardly in the vacuum chamber (3 a considerable distance. i hydrocarbtai is fed to this pipe 87 through a. pipe 38 which is connected with the bottom of the pipe 3? in any suitable manner, the hydrocarbon being drawn through the openin i l to the nozzle 13 by the suction of the engine. and the hydrocarbon being replaced in the vacuum chamber by the vacuum at the top thereof, which is formed with the ivitlulrawal ot the hydrocarbon to the nozzle The top of the casin 5 is closed by a cap 39 which has an inner iihread d0 meshing with an outer thread 41 on the member 5. This serves to prevent the entrance of air into the vacuum chamber 6 

